An angel is generally a supernatural being found in various religions and mythologies. In Abrahamic religions, angels are often depicted as benevolent celestial beings who act as intermediaries between God or Heaven and humanity. Other roles of angels include protecting and guiding human beings, and carrying out God’s tasks. Within Abrahamic religions, angels are often organized into hierarchies, although such rankings may vary between sects in each religion. Such angels are given specific names or titles, such as Gabriel or “Destroying angel.” The term “angel” has also been expanded to various notions of spirits or figures found in other religious traditions. The theological study of angels is known as “angelology.” Angels who were expelled from Heaven are referred to as fallen angels.